EVAL-AD7274CB Analog Devices Inc, EVAL-AD7274CB Datasheet

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EVAL-AD7274CB

Manufacturer Part Number
EVAL-AD7274CB
Description
Manufacturer
Analog Devices Inc
Datasheet
1.EVAL-AD7274CB.pdf (28 pages)

Specifications of EVAL-AD7274CB

Lead Free Status / Rohs Status
Not Compliant
FEATURES
Throughput rate: 3 MSPS
Specified for V
Power consumption
Wide input bandwidth
Flexible power/serial clock speed management
No pipeline delays
High speed serial interface
Temperature range: −40°C to +125°C
Power-down mode: 0.1 μA typ
8-lead TSOT package
8-lead MSOP package
GENERAL DESCRIPTION
The AD7273/AD7274 are 10-/12-bit, high speed, low power,
successive approximation ADCs, respectively. The parts operate
from a single 2.35 V to 3.6 V power supply and feature
throughput rates of up to 3 MSPS. Each part contains a low
noise, wide bandwidth track-and-hold amplifier that can handle
input frequencies in excess of 55 MHz.
The conversion process and data acquisition are controlled
using CS and the serial clock, allowing the devices to interface
with microprocessors or DSPs. The input signal is sampled on
the falling edge of CS , and the conversion is also initiated at this
point. The conversion rate is determined by the SCLK. There
are no pipeline delays associated with these parts.
The AD7273/AD7274 use advanced design techniques to
achieve very low power dissipation at high throughput rates.
The reference for the parts is applied externally and can be in
the range of 1.4 V to V
range to the ADC.
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
11.4 mW at 3 MSPS with 3 V supplies
SPI®-/QSPI™-/MICROWIRE™-/DSP-compatible
70 dB SNR at 1 MHz input frequency
DD
of 2.35 V to 3.6 V
DD
. This allows the widest dynamic input
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
Table 1.
Part Number
AD7273
AD7274
AD7276
AD7277
AD7278
1
PRODUCT HIGHLIGHTS
1. 3 MSPS ADCs in an 8-lead TSOT package.
2. High throughput with low power consumption.
3. Flexible power/serial clock speed management.
4. Reference can be driven up to the power supply.
5. No pipeline delay.
6. The parts feature a standard successive approximation ADC
Parts contain external reference pin.
Allows maximum power efficiency at low throughput rates.
with accurate control of the sampling instant via a CS input
and once-off conversion control.
V
REF
V
1
1
IN
FUNCTIONAL BLOCK DIAGRAM
AD7273/AD7274
Resolution
10
12
12
10
8
T/H
ADCs in 8-Lead TSOT
© 2005 Analog Devices, Inc. All rights reserved.
3 MSPS,10-/12-Bit
APPROXIMATION
Figure 1.
SUCCESSIVE
AD7273/AD7274
CONTROL
10-/12-BIT
DGND
LOGIC
ADC
V
8-lead MSOP
8-lead MSOP
8-lead MSOP
8-lead MSOP
8-lead MSOP
DD
AGND
Package
www.analog.com
SCLK
SDATA
CS
8-Lead TSOT
8-Lead TSOT
6-Lead TSOT
6-Lead TSOT
6-Lead TSOT

EVAL-AD7274CB Summary of contents

Page 1

FEATURES Throughput rate: 3 MSPS Specified for Power consumption 11 MSPS with 3 V supplies Wide input bandwidth 70 dB SNR at 1 MHz input frequency Flexible power/serial clock ...

Page 2

... Typical Connection Diagram ....................................................... 16 Analog Input ............................................................................... 16 Digital Inputs .............................................................................. 16 Modes of Operation ....................................................................... 17 Normal Mode.............................................................................. 17 Partial Power-Down Mode ....................................................... 17 Full Power-Down Mode ............................................................ 17 Power-Up Times......................................................................... 18 Power vs. Throughput Rate....................................................... 20 Serial Interface ................................................................................ 21 Microprocessor Interfacing....................................................... 23 Application Hints ........................................................................... 24 Grounding and Layout .............................................................. 24 Evaluating the AD7273/AD7274 Performance......................... 24 Outline Dimensions ....................................................................... 25 Ordering Guide .......................................................................... 25 Rev Page ...

Page 3

SPECIFICATIONS AD7274 SPECIFICATIONS REF Table 2. Parameter DYNAMIC PERFORMANCE 3 Signal-to-Noise + Distortion (SINAD) Signal-to-Noise Ratio (SNR) 3 Total Harmonic Distortion (THD) Peak Harmonic or Spurious ...

Page 4

AD7273/AD7274 Parameter CONVERSION RATE Conversion Time 3 Track-and-Hold Acquisition Time Throughput Rate POWER RQUIREMENTS Normal Mode (Static) Normal Mode (Operational) Partial Power-Down Mode (Static) Full Power-Down Mode (Static) 5 Power Dissipation Normal Mode (Operational) Partial Power-Down ...

Page 5

AD7273 SPECIFICATIONS REF Table 3. Parameter DYNAMIC PERFORMANCE 3 Signal-to-Noise + Distortion (SINAD) 3 Total Harmonic Distortion (THD) Peak Harmonic or Spurious Noise (SFDR) Intermodulation Distortion ...

Page 6

AD7273/AD7274 Parameter POWER RQUIREMENTS Normal Mode (Static) Normal Mode (Operational) Partial Power-Down Mode (Static) Full Power-Down Mode (Static) 5 Power Dissipation Normal Mode (Operational) Partial Power-Down Full Power-Down 1 Temperature range from −40°C to +125°C. 2 ...

Page 7

TIMING SPECIFICATIONS REF DD are specified with (10 Table 4. Limit MIN MAX ...

Page 8

AD7273/AD7274 TIMING EXAMPLES For the AD7274 brought high during the 14 rising edge after the two leading zeros and 12 bits of the conversion are provided, the part can achieve the fastest throughput rate, 3 MSPS. If ...

Page 9

ABSOLUTE MAXIMUM RATINGS T = 25°C, unless otherwise noted. A Table 5. Parameters V to AGND/DGND DD Analog Input Voltage to AGND Digital Input Voltage to DGND Digital Output Voltage to DGND Input Current to Any Pin Except Supplies Operating ...

Page 10

AD7273/AD7274 PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS AD7273/ SDATA 2 AD7274 CS 3 TOP VIEW AGND 4 (Not to Scale) Figure 8. 8-Lead MSOP Pin Configuration Table 6. Pin Function Descriptions Pin No. MSOP TSOT Mnemonic Description 1 ...

Page 11

TYPICAL PERFORMANCE CHARACTERISTICS 16384 POINT FFT – 3MSPS SAMPLE F = 1MHz IN SINAD = 71.05 THD = –80.9 –40 SFDR = –82.2 –60 –80 –100 –120 FREQUENCY (kHz) Figure 10. AD7274 Dynamic Performance at 3 MSPS, Input ...

Page 12

AD7273/AD7274 –70 –80 –90 –100 100mV p-p SINE WAVE DECOUPLING –110 0 500 1000 1500 SUPPLY RIPPLE FREQUENCY (MHz) Figure 16. Power Supply Rejection Ratio (PSRR) vs. Supply Ripple Frequency Without Decoupling 1.0 0.8 0.6 0.4 ...

Page 13

CODES 16000 14000 12000 10000 8000 6000 4000 2000 0 2045 2046 2047 2048 CODE Figure 22. Histogram of Codes for 30,000 Samples 12.0 11.5 11.0 10.5 10.0 2049 2050 1.4 Rev Page ...

Page 14

AD7273/AD7274 TERMINOLOGY Integral Nonlinearity (INL) The maximum deviation from a straight line passing through the endpoints of the ADC transfer function. For the AD7273/ AD7274, the endpoints of the transfer function are zero scale at 0.5 LSB below the first ...

Page 15

CIRCUIT INFORMATION The AD7273/AD7274 are high speed, low power, 10-/12-bit, single supply ADCs, respectively. The parts can be operated from a 2. 3.6 V supply. When operated from any supply voltage within this range, the AD7273/AD7274 are capable ...

Page 16

AD7273/AD7274 TYPICAL CONNECTION DIAGRAM Figure 27 shows a typical connection diagram for the AD7273/ AD7274. An external reference must be applied to the ADC. This reference can be in the range of 1 reference, such as the ...

Page 17

MODES OF OPERATION The mode of operation of the AD7273/AD7274 is selected by controlling the logic state of the CS signal during a conversion. There are three possible modes of operation: normal mode, partial power-down mode, and full power-down mode. ...

Page 18

AD7273/AD7274 edge the device begins to power up and continues to power up until after the falling edge of the held low. The power-up time required must elapse before a conversion can be initiated, ...

Page 19

SCLK SDATA THE PART BEGINS TO POWER SCLK A SDATA INVALID DATA THE PART ENTERS PARTIAL POWER DOWN SCLK THREE-STATE INVALID DATA SDATA THE PART BEGINS TO POWER UP ...

Page 20

AD7273/AD7274 POWER VS. THROUGHPUT RATE Figure 34 shows the power consumption of the device in normal mode, in which the part is never powered down. By using the power-down mode of the AD7273/AD7274 when not performing a conversion, the average ...

Page 21

SERIAL INTERFACE Figure 36 through Figure 38 show the detailed timing diagrams for serial interfacing to the AD7274 and AD7273, respectively. The serial clock provides the conversion clock and controls the transfer of information from the AD7273/AD7274 during conversion. The ...

Page 22

AD7273/AD7274 SCLK t 3 SDATA Z ZERO DB11 THREE- STATE TWO LEADING ZEROS SCLK SDATA Z ZERO DB9 THREE- STATE TWO LEADING ZEROS t CONVERT t ...

Page 23

MICROPROCESSOR INTERFACING AD7273/AD7274 to ADSP-BF53x The ADSP-BF53x family of DSPs interfaces directly to the AD7273/AD7274 without requiring glue logic. The SPORT0 Receive Configuration 1 register should be set up as outlined in Table 8. AD7273/ AD7274 1 SPORT0 SCLK RCLK0 ...

Page 24

... PC via the evaluation board controller. The evaluation board controller can be used in conjunction with the AD7273/AD7274 evaluation board, as well as many other Analog Devices evaluation boards ending in the CB designator, to demonstrate/evaluate the ac and dc performance of the AD7273/AD7274. ...

Page 25

... AD7273BRMZ-REEL −40°C to +125°C AD7273BUJ-REEL7 −40°C to +125°C 2 AD7273BUJZ-500RL7 −40°C to +125°C 3 EVAL-AD7274CB 3 EVAL-AD7273CB 4 EVAL-CONTROL BRD2 1 Linearity error refers to integral nonlinearity Pb-free part. 3 This can be used as a standalone evaluation board or in conjunction with the EVAL-CONTROL board for evaluation/demonstration purposes. ...

Page 26

AD7273/AD7274 NOTES Rev Page ...

Page 27

NOTES Rev Page AD7273/AD7274 ...

Page 28

AD7273/AD7274 NOTES © 2005 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D04973–0–9/05(0) T Rev Page ...